O’Malley is scheduled to appear in Bethesda with Montgomery County officials and others at an event touting a “Solar Power Pole car-charging system” developed by a Columbia-based company.

Advanced Technology & Research Corp. says its devices, which the company is manufacturing and assembling in Maryland, are the first of their kind. Solar panels mounted on poles capture power from the sun throughout the day, generating enough energy to charge two vehicles at a time, according to the company.

O’Malley has sponsored several measures in recent legislative sessions intended to spur the use both of electric cars and solar power in Maryland. In April, he drove a Chevy Volt to highlight the introduction of eight new electric-car charging stations at Baltimore-Washington International Marshall Airport.